<template>
  <div
    v-if="isExternalLink"
    :style="styleExternalIcon"
    class="svg-external-icon svg-icon"
    v-bind="$attrs"
  />
  <svg v-else :class="svgClass" aria-hidden="true" v-bind="$attrs">
    <use :xlink:href="iconName" />
  </svg>
</template>

<script lang="ts">
import { defineComponent, computed, toRefs } from 'vue'
// doc: https://panjiachen.github.io/vue-element-admin-site/feature/component/svg-icon.html#usage
import { isExternal } from '@/utils/validate'

export default defineComponent({
  name: 'SvgIcon',
  props: {
    iconClass: {
      type: String,
      required: true,
    },
    className: {
      type: String,
      default: '',
    },
  },
  setup(props) {
    const { iconClass, className } = toRefs(props)

    const isExternalLink = computed(() => {
      return isExternal(iconClass.value)
    })

    const iconName = computed(() => {
      return `#icon-${iconClass.value}`
    })

    const svgClass = computed(() => {
      if (className.value) {
        return 'svg-icon ' + className.value
      } else {
        return 'svg-icon'
      }
    })

    const styleExternalIcon = computed(() => {
      return {
        mask: `url(${iconClass.value}) no-repeat 50% 50%`,
        '-webkit-mask': `url(${iconClass.value}) no-repeat 50% 50%`,
      }
    })

    return { isExternalLink, iconName, svgClass, styleExternalIcon }
  },
})
</script>

<style scoped>
.svg-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.15em;
  fill: currentColor;
  overflow: hidden;
}

.svg-external-icon {
  background-color: currentColor;
  mask-size: cover !important;
  display: inline-block;
}
</style>
